Ma and Torquato, guided by the scaled-particle theory [1]}, [2]}, proposed the following form of \(P(\delta )\)  for Debye random media realized with the Yeong-Torquato procedure
\(P(\delta ) = \left(\frac{\pi \phi _2}{a} + 2p_1\delta \right)\exp \left(-p_1\delta ^2 - \frac{\pi \phi _2}{a}\delta \right) .\) 
